Re: [Qemu-devel] [PATCH 1/2] pci: Add pci_device_get_host_irq

[Jan Kiszka]

On 2012-05-30 15:34, Michael S. Tsirkin wrote:
> Below's as far as I got - hopefully this
> explains what I had in mind: for deep hierarchies
> this will save a bus scan so I think this makes sense
> even in the absense of kvm irqchip.
> 
> Warning: completely untested and known to be incomplete.
> Please judge whether this is going in a direction that
> is helpful for your efforts. If you respond in the positive,
> I hope to be able to get back to this next week.

We need to
 - account for polarity changes along the route
 - get rid of irq_count as it is no longer updated in the fast path,
   thus useless on routing updates

So it's a bit more complicated and requires a some broader refactorings.
But there is likely some room for simplifications in the end, true.

Jan

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